Resistive-type Humidity Sensor Based on CA-NH4BF4-PEG600 Thin Films

The resistive-type humidity sensor was prepared by using dip-coating method based on CA-NH4BF4-PEG600 plasticized polymer electrolytes film on a glass substrate. The electrical properties of the film are examined as a function of relative humidity to elucidate the potential of the film act as sensory properties in humidity sensor. The sensor well responded towards humidity with a relatively good in linearity though it is depended on the applied frequency. The temperature dependence of resistance followed Arrhenius law and the activation energy decreased with increasing in relative humidity. The hysteresis phenomenon showed the resistance on desiccation process is slightly lower than the resistance on humidification process at all temperatures. The stability of fabricated humidity sensor stabled up to 30 days.